Tire-rim-breaking jack



Aug. 25, 1925.

PATENT FFCE.

MELVIN C. DART, OF NEW YORK, I\T. Y.

TIRE-RIM-BREAKNG JACK.

Application filed August 25, 1923.

To all whom t may concern.'

Be it known that I, MELVIN C. DART, a citizen of the United States, anda resident of New York city, in the county of the Bronx and State of NewYork, have invented certain new and useful Improvements in aTire-Riin-Breaking Jack, of which the following is a full, clear, andexact description.

Among the principal objects which the present invention has in view are:To avoid friction in the operation of the device; and to simplify andcheapen the construction of the apparatus.

Figure 1 is a side elevation of an apparatus showing the same in -activerelation to a tire rim, fragments of a tire being shown as mounted onsaid rim.

Figure 2 is a section on enlarged scale taken as on the line 2 2 in Fig.1.

Figure 3 is a section taken on the line 3-3 in Fig. 2.

Figure 4 is a detailed view on enlarged scale showing the foot plate ofthe jack and parts associated therewith.

Figure 5 is a perspective View of one of the breaker arms with which theapparatus is provided.

Description In the present apparatus a lifting Jack is employed inconjunction with breaker arms or links arranged to secure a three pointengagement with a split rim for pneumatic automobile tires. The jack isemployed when not used as a rim breaker for the usual work of raisingand lowering the body of an automobile. l

To this end the jack is provided with a screw-threaded plunger 10, thethreads of which are engaged by threads of a rotary nut 11.

The nut 11 has an annular liange 12, the face of which is beveled andprovided with gear teeth as in a beveled gear. rlhe ends of the nut 11form seats for ball races at both sides of the said nut wherein theballs 14 operate the races 13 being hardened as is usual in thisconstruction. A steel washer 15 at the upper and lower bearings isintroduced between the races 13 and the cover 16 and end of the standard17, respectively.

The standard 17 is tubular having lateral extensions 18 wherein groovesare formed for a pin 19. By reason of the engagement of the ends of thepin 19 with the slots in the Serial No. 659,264.

extensions 18, the plunger 10 is elevated or depressed in correspondencewith the rotation of the nut 11.

The nut 11 is rotated by means of a beveled pinion 20. The pinion 20 hasa bearing on the pin 21, The pin 21 has a head 22 which enters thewrench socket 23 and serves to hold the pinion 20 in position. The pin21 is driven through a socket in the body of the standard 17 and isthere held by the retaining pin 24 which is driven through a boringprovided therefor in the standard 17 and pin 21, entrance to the saidboring being from above and through the shoulder on which is seated thelower washer 15.

'.lhe cover 16 is held permanently in positlon by screw bolts 25 andthereafter prevents the lift of the washer 15 covering the balls 14 inthe top race of the double antifriction bearing. This enables the jackto be employed for forcefully contracting the length thereof as well asfor expanding the same.

At the upper end of the plunger 10 a hook-shaped head 26 is mounted andheld by means of the pin 27. The pin 27 is removably mounted on theplunger 10 to provide for the substitution of any one of a series ofheads, best adapted for special purposes. 1n the present instance thehead 16 has an upper extension 28, the end whereof has a hook 29 forengaging the lip of a tire rim such as indicated by the numeral 30. Adropped bracket extension 31 is extended from the opposite side of thehead 26, which extension has an extended bracket 32 adapted for engagingfor lifting a load at a lower level than the pad or head 26.

As is best shown in Fig. 4 of the drawings the foot 33 is partedlaterally to form passageways 34. The passageways 34 are flanged oneither Yside by webs 35 wherein are formed circular recesses 36, eachhaving a narrow entrance for the passage of crossbar heads 37 on thebreaker arms 33.

To insert the heads 37 into the recesses 36, it is necessary to raisethe arms 38 to the upright position substantially as shown at the leftof Fig. 4 of the drawings. Having inserted the head 37, the 4arms 38 aredropped to the position shown at the right of said ligure of thedrawings in which position the heads cannot be withdrawn from therecesses 36.

It will be noted that in this position the heads 37 have an even andfirm seat at both edges thereof against the sides of the recesses 36 onthe opposite sides of the passageways 34. rIhe passageways 34 aresufficiently wide and the webs 35 sufficiently separated to provide anon-rocking engagement of the head 37 with the webs 35. This arrangementis particularly advantageous ,when the breaker arms are in position asshown in Fig. 1 of the drawings, in which position the movement of theplunger lO and parts associated therewith results in contracting orexpanding the rim 30.

rlhe breaker arms 38 are provided at their outer ends with heads 39, thehooklike extension r-10 of which engages the lip of the rim 30 in amanner similar to that of the hook 29 on the extension 28.

It will be understood that when in operation the arms 38 may be swung toany desired position.

then a rim 30 is to be removed from the tire 4:1 it is foundadvantageous to move one of the arms 33 close to and at one side of thebrake 42 in the said rim, while the other arm 38 is removed therefrom.In this position of the parts, the resistance to the movement of thelatter mentioned arm is greater than the resistance to the movement ofthe first mentioned arm. The immediate resultof this is that the end ofthe split rim 30 adjacent the brake 42 is lifted, while the rim 30 iscontracted sufciently to cause the lifted end to overlie the other end.

The breaking of the rim having been thus accomplished, the arms arespread to the position substantially as shown in Fig. 1 of the drawingswhen the continued retraction of the plunger 10 exerts a contractingstrain on the whole rim 30, causing it to free itself from the tire 11.The rim 30 and breaker are now left in this position while the tire isrepaired, or a substitute therefor is replaced. Vhen this is done, thepinion 2O is rotated to extend the plunger 10 with the result that therim 30 is expanded. The expansion being continued the split ends passeach other when the resiliency of the rim disposes the two ends thereofin flush relation. If the rim be provided with a lock it is now adjustedand the pinion 20 is rotated to retract the plunger 10 until the arms 38may be released therefrom.

The apparatus being now removed from active position within the rim, isnow stowed away or the arms 38 are removed from the standard 17 when thesame may be employed as a jack for lifting the car or other load, in themanner usual with jacks of this character.

It is obvious that the employment of a rotary nut such as indicated bythe numeral 11 between double friction reducing bearings balances thethrust strain in both directions and relieves the strain on the pinion20 permitting the same to be operated freely by means of hand crank orextension bar thereof which is introduced into the squared wrench socket23 of said pinion.

Claims:

1. A tire rim breaking jack comprising a tubular standard embodying aspreading foot having radially disposed passageways therethrough andbracing webs flanking said passageways, said webs having circularrecesses provided with relatively narrow edge openings thereinto; areciprocating plunger non-rotatively mounted in said standard; means forreciprocating said plunger under power in said standard; and a pluralityof breaker arms, each having a cross head at the inner end thereofiiattened substantially parallel with said breaker arms, the lesserdimension of said cross head being less than the opening to saidrecesses, and the major dimension being substantially equal to thediameter of said recesses whereby said cross heads may be insertedwithin said recesses and turned to a position in which they cannot bewithdrawn from said recesses; and means provided at the outer ends ofsaid breaker arms and said plunger for engaging tire rims for expandingand contracting the same in correspondence with the extension orwithdrawal of said plunger to and from said standard.

2. A tire rim breaking jack comprising a double acting vehicle liftingjack; power means for extending and contracting the parts of said jack;and a plurality of breaker arms having pressure heads and hook-shapedextensions therefrom for engaging the outer edge of the tire rim, saidbreaker arms having at the inner ends thereof cross heads evenlyextended at opposite sides of the longitudinal center of said breakerarms; and means for removably engaging the lower end of said jack andsaid cross arms while in service so that the longitudinal center of saidarms and said jack are disposed in the substantial coincident plane.

3. A tire rim breaking jack comprising a screw-threaded reciprocatingplunger; a standard for housing said plunger non-rotatively, saidstandard having a spread base provided with radially extendedpassageways and reinforcing webs flanking said passageways, said webshaving circular recesses provided with edge openings the centers of saidopenings being coincident with the radii of said recesses substantially15 degrees upward from the bottom of said base; a rotary nut, thethreads of which mesh with the threads on said plunger; a housingtherefor permanently mounted on said standard; a plurality of frictionreducing thrust bearings for said nut disposed above and below the sameand an annular beveled gear toothed flange on said nut for rotating thesame; a pinion wheel rotatively mounted in said standard with the teeththereof engaged with the teeth of said iange; and

' means whereby said pinion may be engaged by a manually operated toolfor rotating said pinion.

4. A tire rim breaking jack comprising a screw-threaded reciprocatingplunger; a standard for housing said plunger non-rotatively, saidstandard having a spread base provided with radially extendedpassageways and reinforcing webs ianking said passageways, said webshaving circular recesses provided with edge openings the centers of saidopenings being coincident with the radius of said recesses substantially45 degrees upward from the bottom of said base; a rotary nut, thethreads of which mesh with the threads on said plunger; a plurality offriction reducing thrust bearings for said nut disposed above and belowthe same and an annular beveled gear toothed flange on said nut forrotating the same; a pinion wheel rotatively mounted in said standardwith the teeth thereof engaged with the teeth of said flange; and meanswhereby said pinion may be engaged by a manually operated tool forrotating said pinion, said means embodying an extended shank adapted tobe operatively engaged by an hand wrench, and a plurality of breakerarms removably attached to said standard when inactively disposed, andnonremovably attache-d when actively disposed, said arms being adaptedfor engaging a tire rim for pulling same towards the center thereof orfor expanding sam'e from the center thereof.

5. A tire rim breaking jack Comprising a power reciprocated plunger; ahook-shaped head adapted for pressing outward from said jack or pullingtoward the same; and a spread base for holding said jack in uprightservice position, said base having recesses formed therein in parallelrelation to said plunger; and a plurality of breaker arms removablyattached to said base when disposed inactively and non-removably whendisposed actively, said arms having heads hooked to provide means forpressing outward from said base andA for pulling toward said base incorrespondence with the movement of said plunger.

MELvrN o. DART.

